Grace's family are wardens of the Griffin map, using its teleport technology to fight crime. Grace and Tom reckon they're ready to tackle a mission together but are disappointed when Mum sends them to a quiet mountain village where ravens have been pestering the locals. Surely they won't be any opportunities to use their exciting gadgets or combat skills there? Yet why does it seem like the ravens are protecting something? 8+ Book 3 in the Griffin Gate series.